Gluer for blanks



L. E. LA BOMBARD AND M. H. SIDEBOTHAM.

GLUER FOR BLANKS.

APPLICATION FILED FEB. e. 1920.

Patented Apr. 11, 1922.

Fig.4.

A Tramw- 7.

UNITED STATES, PATENT OFFICE.

I LEON a LA 30mm, or crmnsm, AND MELVIN msmnnbrmu, or oLmToNnALE,

MASSACHUSETTS, ASSIGNORS TO SPECIALTY AUTOMATIC MACHINE COMPANY, OFCHELSEA, HASSAC HUSETT A CORPORATION OF MASSACHUSETTS.

GLUER FOR BLANKS.

Specification of Letters I atent. Patented Apr. 11,

Application filed February '6, 1920. Serial No. 356,704.

referred to generically as glue, to articles such as foldable paper orpasteboard blanks, and the invention has particular reference to devicesof this character which are mounted as attachments to box foldingmachines to supply stripes or bands of glue to surface portions ofblanks while the latter are passa ing from a feeding mechanism tofolding mechanism. Such devices usually employ a thin wheel or disk toapply the glue to the passing blanks, and the nature of the glue is suchthat if it gets anywhere other than onto the desired portions of theblanks, trouble is caused.

Some of the difficulties heretofore encountered are caused by leakage ofglue around the wheel shaft which usually ex; tends through both wallsof the glue box. Others result from the escape of glue to alocationabove the usual clearer or doctor employed, from which locationit gets smeared onto the blanks in excessive quan tities. To overcomethese objections are im ortant objects of the present invention.

Ether objects of the inventionare to proe vide a gluerof the generaltype mentioned which can be properly lubricated without liability of thelubricant getting into the glue; to provide a gluer whlch Wlll containglue to a level any where abovethe shaft of the disk wheel withoutleakage, thereby reducin the size of the receptacle required for holdinga given quantit of glue; to provide a structure which enab es the diskto be located so close to one wall of the box that carryin belts for theblanks can run so close alon si e the disk as to accommodate the smalest sizes of blanks; to provide a structure which will enable the levelof the water used for transmitting heat to the glue to comprises acastin be readily seen,thereby reducing the liability of burn ng out theheating unit usually em- "ployed for heating the water; and to provideother improvements which will be explained hereinafter.

- To these ends the invention consists in the gluing device constructed,and having novel combinations, substantially as hereinafter describedand claimed.

Of the accompanying drawings- Figure 1 is a perspective view of thegluer, with a portion of its separable wall broken away, and omittingthe removable cover which may be employed for the portion of the topwhich is shown as open.

Figure '2 represents a transverse vertical section.

Figure 3 represents a detail 33 of Figure 2.

Figure 4 represents a detail section of the combined scraper or doctorand pocket, and a side elevation :of a portion of the glue disk orwheel.

a The main portion 12 of the box preferably so as to consist of onepiece a side of which is open, when forined or being cleaned, said openside being closed Water and glue tight by a plate .13 the upper edge ofwhich is substantially flush with the top of the box (Fig. 2). Said boxhas apertured lugs 14 to .be mounted on rods of the machine in which theglueris-to be used. Above the bottom of the box is a partition 15,preferably slightly inclined as shown in Figure 1, one end of thepartition-terminating in an upright wall 16. The partition section online Y 15 and wall 16 are parts of the casting.

A threaded hole 17 is for the connection of a heater, such as anelectrical heating unit, which heater in practice. extends under thepartition 15. In practice water occupies the chamber below saidpartition and'also a portion of the chamber between the wall 16 and theend of the box. Vapor or steam readily finds its way alon the inclinedbottom surface of the partition 15. If a cover'is employed for the openportion of the top of the box, it will be one which is readilyremovable. Then the level of the water can be easily seen so that morewater can be added if the level is getting so low that there isliability of the heating unit burning out, or so low that heat will notbe properly transmitted from the unit, by. means of the water, to theglue above partition 15.

Also as an integral portion of the casting is a vertical web 18 (Figs. 2and 3) having an enlargement at its lower edge to provide a bearing 19in which is fitted a bushin .20. Mounted in the bushing 20 is the shaft21 of the glue wheel 22 one face of which is recessed as' at 23, thestructure of the wheel being such that its glue-applying rim is offsetlaterally from the body of the wheel as best shown in Figure 2. Theoffset rim of the wheel extends above the plane of the top of the box,the edge of said top being recessed for this purpose (Fig. 1). Saidrecess, coacting with the inner face of the removable side plate 13,forms the necessary slot for the passage of the wheel rim. hen the plate13 .is removed the recess can be easily cleaned if glue has accumulatedtherein. However the chief reason for this structure is that since theplate 13 is not relied upon for strength it can be quite thin asindicated in Figure 2 and since the wheel rim is close to the inner faceof said thin plate it will also be at the minimum distance from theusual blank carrier travelling close to the outer face of plate 13 whenthe gluer and such carrier are relatively adjusted for Keyed to theshaft is a sprocket wheel 26 (Fig. 2) which is driven by a sprocketchain (not shown) which leads through apertures in a protecting casing27 for said wheel 26.

The shaft 21 is formed with a spiral groove 28 and the casting web 18has a duct 29 leading in to a hole in the bushing. Lubricating oil froman oil cup 30 passes through the duct 29 and the hole in the bushingfrom which it works into the spiral groove 28 to lubricate the shaft.

Rising from the top of the box casting is a post 31 in which is mounteda pin shaft 32 having an arm 33 the end of which has a threaded aperturefor a screw'34 the lower end of which normally bears on the top of thebox. Projecting laterally from the arm 33 and secured thereto by a screw46 is a pin 35 to which is fixed a thin shoe 36 having a bevelled loweredge under which blanks to be glued are carried by any usual blankcarrier. shaft 32 by a set screw-38, and a spring 39 connecting saidcollar and the post 31 acts A collar 37 is secured to the pin.

to hold the arm 33 with its screw 34 normally bearing on the top of thebox. Said screw, in practice, is usually set so as to prevent contact.of the shoe 36 with the wheel 22, but

close enough to it to ensure yielding pressure on a passing blank tocause the under surface of said blank to take a stripe or band of gluefrom the wheel. The amountof pressure is varied by rotatively adjustingthe collar 37 on the pin shaft 32. a

The structure just described enables the shoe to yield without affectingits normal adjustment, if two or more superposed blanks shouldaccidently be fed between it and the glue wheel.

Mounted in a bearing in the upper corner of the box is a shaft 40 towhich is secured the clearer or doctor 41 formed with a substantiallyvertical wall, two side walls, and a substantially horizontal wall whichlatter is slotted or recessed to provide an edge 42 which determines thethickness of the film I of glue to be carried up by the wheel the rim ofwhich travels through the slot. The .space between the four describedwalls of the clearer and the periphery of the wheel forms asubstantially triangular pocket the purpose of which will be presentlydescribed.

Secured to the end of the shaft 40 outside the rear wall of the box isanarm 43 the lower end of which carries a stud 44 in which, is mounted a.screw 45 in position for its inner end to bear against the end wall ofthe'box. By adjusting the screw 45 the shaft 40 is. rocked more or lessso that the edge 42 of the clearer may be varied in distance from theperiphery of the wheel 22.

Some box folding machines for which the present gluer is designed as anattachment operate at a very high speed. Sometimes more than 60.000blanks pass the wheel 22 in an hour. Of course the wheel is rotated at aperipheral speed approximately the same as the speed of travel of theblanks. At

' such a speed the wheel acts to churn the glue in the box especiallythat glue which is adjacent. the rising portion of the wheel. Theclearer 41 is formed as hereinbefore de scribed so as to act as abarrier to prevent the glue from acquiring such a condition due tochurning as would result in its being forced out around the wheel abovethe doctor edge 42. The churned glue is mainly confined in the pocketwithin the four walls of the clearer and can only get out of that pocketpastthe edge 42. with the result that no glue can reach the top of thebox. All of the glue carried up by the wheel and which is nottransferred to passing blanks is carried back into the box by the wheel.

Having now described our invention, we

claim:

1. In mechanism of the character described, a glue receptacle comprisinga continuous bottom, two end walls and one side Wall and a shaft bearingformed integrally, 'a removable plate forming the other sidewall, ashaft mounted in said bearing, a glue wheel carried by said shaft closeto said removable plate, and means for conducting oil to saidshaftbearing through w an integral portion of the receptacle.

In mechanism of the character descrlbed, a receptacle comprising acasting presenting a bottom, two end Walls, one side wall and an angularpartition, a removable side wall secured to the edges of the bottom andend wall of the casting, the angular partition being of a width toenable a tight joint to be formed between its edgeand the removable sidewall, and a glue wheel in the compartment of the receptacle above saidpartition.

4. In mechanism of the character described a glue receptacle having anintegral web depending from its top and formed with a shaft bearing, anda glue wheel having its shaft in said bearing, said web having a portfor conducting oil to the shaft.

5. In mechanism of the character described, a glue receptacle having anintegral web depending from its top and formed with a shaft bearing, aglue wheel having its shaft extending through said bearing, and meansfor drawing the shaft outward through the bearing to prevent escape ofglue past the wheel into said bearing.

6. In. mechanism of the character de-- scribed, a glue receptacle havinga thin removable side wall, and a glue wheel pro jecting above the topof said wall and close to it, said receptacle having an integral topportion one edge of which coacts with the top of the side wall topresent a slot for the upper portion of the glue wheel.

7. n m'echanismof the character described, a glue receptacle having athin side wall, and a glue wheel projecting above the top of said walland having a recessed outer face, the "rim of the wheel being offset topresent its outer face close to said side wall.-

8. In mechanism of the character described, a glue receptacle having anintegral top portion provided with a recess in its edge,a glue wheelmounted in the receptacle and presenting a portion of its periphery inand above said recess, and a removable side plate close to the outerface of the wheel.

9. In mechanism of the character described, a glue receptacle having atop, a glue wheel projecting above said top, athin edged bladeyieldingly mounted above the wheel, and means for adjustablylimiting"the normal distance between the blade and wheel.

10. In mechanism of the character described, a glue receptacle having atop, a glue wheel projecting above said top, a rock shaft having an armprovided with a screw, a spring normally holding the arm with its screwbearing on the top of the receptacle, and a shoe carried by said arm inposition to ensure contact of passing blanks with the glue wheel.

11. In mechanism of the character described, a glue receptacle, a rotarydisk for transferring glue from .the receptacle to passing blanks, and abarrier device located within the receptacle at a point below the normallevel of glue in the receptacle to prevent excessive churning of theglue by the rotary disk.

12. In mechanism of the character described, a glue receptacle, a rotarydisk for transferring glue from the receptacle to passing blanks, and aclearer having side portions extending past the sides of the disk, saidclearer being recessed opposite the periphery of the disk.

13. In mechanism of the character described, a glue receptacle, a rotarydisk for transferring glue from the receptacle to passing blanks, and apivotally mounted. and adjustable clearer having a recessed portionthrough which the marginal portion of the disk passes. T

14. In mechanism of'the character described, a glue receptacle, a rotarydisk for transferring glue from the receptacle ;to

